class Solution {
public:
int bitSquareSum(int n) {
int sum = 0;
while(n > 0)
{
int bit = n % 10;
sum += bit * bit;
n = n / 10;
}
return sum;
}
bool isHappy(int n) {
int slow = n, fast = n;
do{
slow = bitSquareSum(slow);
fast = bitSquareSum(fast);
fast = bitSquareSum(fast);
}while(slow != fast);
return slow == 1;
}
};
雙指針經典 力扣202.快樂數(快慢指針)
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